I mean yeah if you're on a pitch black highway and you can't see anything outside your headlight beams, you probably shouldn't be going 80 even if that's the speed limit.
But we don't know how many other vehicles were on the road and what light they were casting. The bystander who reported witnessing the crash was within visual distance, so couldn't have been too far ahead of the MachE. It wasn't reported if there were any other vehicles. If you have enough vehicles on the road (with their lights on) lack of overhead illumination isn't too significant.